Strange Casmaria (Cassis) - Printable Version

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Strange Casmaria (Cassis) - Buddym - 12-20-2017

I collected this shell from dredged material from the Red Sea, Saudi Arabia many years ago.
It would appear to be a specimen of Casmaria ponderosa, (Syn. Cassis ponderosa) but it has a diagonal rib with the same markings as that around the aperture.
Could this be a freak or have I miss-identified it?
It is 45 mm in height.

RE: Strange Casmaria (Cassis) - paul monfils - 12-25-2017

This is Casmaria ponderosa. A misplaced varix like this can occur in any species of Cassidae. It indicates the location of the shell lip during a past period of restricted shell growth, which could be caused by a period of unusually low temperature, or a period when food was scarce, etc.

RE: Strange Casmaria (Cassis) - Buddym - 12-27-2017

Thank you for this explanation.